Handi Quilter has an upgrade kit available for the original machines. This is an upgrade to the aluminum HQ Precision-Glide Track for the carriage (which the machine sits on). It includes HQ Precision-Glide Wheels for the machine. For more information on this upgrade visit the upgrade information page and look for information on upgrades to your existing machine. The kits are specific to the machine you own.
NOTE: You will also need to upgrade the tracks on your table/frame. That is a separate kit found here.